Publications by Jeff Allen
Sermon Sentiment Analysis
Matt Chandler vs. Mark Driscoll I came across an interesting API from Viral Heat which is capable of “Sentiment Analysis.” This analysis is designed to capture the sentiment of a statement by ranking it on a scale from -1 to 1. For instance, a chipper sentence like “The smell of roses makes me giddy!” is rated a solid 0.82 (a very positiv...
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Color Palettes in RGB Space
Introduction I’ve recently been interested in how to communicate information using color. I don’t know much about the field of Color Theory, but it’s an interesting topic to me. The selection of color palettes, in particular, has been a topic I’ve been faced with lately. I downloaded 18 different sequential color palettes from Cynthia B...
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Color Palettes in HCL Space
This is a quick follow-up to my previous post about Color Palettes in RGB Space. Achim Zeileis had commented that, perhaps, it would be more informative to evaluate the color palettes in HCL (polar LUV) space, as that spectrum more accurately describes how humans perceive color. Perhaps more clear trends would emerge in HCL space, or color palett...
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Reconstruct Gene Networks Using Shiny
Check out the application on Glimmer! http://glimmer.rstudio.com/qbrc/grn/ We’ve been experimenting with RStudio’s new Shiny software as a way to quickly and easily create interactive, responsive web applications which are able to leverage complicated analytics back-ends built in the R programming language. We created a simple interface w...
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Visualize Color Palettes in Interactive 3D Grid (Shiny + RGL)
You can view the application online at http://trestletechnology.net:3838/rgl/! (Bear with us as we try out the very early release of Shiny Server. There may be some downtime and manual restarts of the service required in the next couple of weeks. Please drop us a line if it’s not working as you expected.) This is an adaptation of some previous...
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Dallas R Users: Learn Shiny this Saturday, 2/9
Just a heads-up for any R users in the Dallas/Fort Worth Metroplex: I’ll be presenting at the Dallas R Users Group this Saturday, 2/9/2013 at 10:00AM at the University of Dallas (1845 East Northgate Drive, Irving, TX). I’ll be talking about how to use RStudio’s new Shiny framework to create R-powered web applications. For the uninitiated, S...
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Deploying Shiny Server on Amazon EC2
Setting up Shiny Server on Amazon’s Elastic Compute Cloud (EC2) can be a bit of a process if you’re unfamiliar with Linux system administration. Thankfully, we’ve done all the hard work for you! If you’re looking to get Shiny Server running in EC2 without delay, just boot up an instance of our public Amazon Machine Image (AMI): ami-e2a335...
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Introduction to Shiny Slides
Below you can download the slides presented on February 9, 2013 at the Dallas R Users Group on RStudio’s Shiny framework which allows you to create interactive web applications in R. No knowledge of HTML or JavaScript is required! I introduce the alternatives and history of R programming on the web, the reactive programming model, and get into ...
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Analysis of Public .Rhistory Files
GitHub recently launched a more powerful search feature which has been used on more than one occasion to identify sensitive files that may be hosted in a public GitHub repository. When used innocently, there are all sorts of fun things you can find with this search feature. Inspired by Aldo Cortesi’s post documenting his exploration of public s...
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Graphical Tools (rgl) on a Headless Shiny Server
If you’ve encountered errors such as Warning in rgl.init(initValue) : RGL: unable to open X11 display Warning in fun(libname, pkgname) : error in rgl_init or Error: rgl_dev_getcurrent when trying to use a graphically based package like RGL with Shiny Server, then you’re in the right spot. The issue is likely that you’re running R or Shin...
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